Telephone system



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A. E. LUNDELL AND F. A. STEARN.

TELEPHONE SYSTEM.

APPLICATION FILED JULY 22, I918.

1,345,01 6. Patented June 29, 192() l6 SHEETSSHEET I.

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TELEPHONE SYSTEM. APPLICATION FILED JULY 22,1918.

Patented June 29, 1920.

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APPLICATION FILED JULY 22, I9I8.

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A. E. LUNDELL AND F. A. STEARN.

TELEPHONE SYSTEM.

APPLlCATION FILED JULY 22. I918.

Patented June 29, 1920.

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TELEPHONE SYSTEM.

APPLICATION FILED JULY 22. 1918.

Patented June 29, 1920.

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TELEPHONE SYSTEM.

APPLICATION FILED JULY 22. I9I8.

Patented June 29, 1920.

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TELEPHONE SYSTEM.

A. E. LUNDELL AND F. A. STEARN. TELEPHONE SYSTEM.

APPLICATION FILED JULY 22. 1918.

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TELEPHONE SYSTEM.

APPLICATION FILED JULY 22.1918.

Patented June 29, 1920.

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TELEPHONE SYSTEM.

APPLICATION FILED JULY 22, H8-

1,345,016. Patented June 29, 1920.

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TELEPHONE SYSTEM.

APPLICATION FILED JULY 22, 1918.

Patented June 29, 1920.

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TELEPHONE SYSTEM.

APPLICATION FILED JULY 22,1918.

Patented June 29, 1920.

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TELEPHONE SYSTEM.

APPLlCATlON FILED JULY 22, 1918.

Patented June 29, 1920.

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A. E. LUNDELL AND F. A. STEARN.

TELEPHONE SYSTEM.

APPLICATION FILED JULY 22,1918.

1,345,016. PatentedJune29,1920.

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TELEPHONE SYSTEM.

APPLICATION FILED JULY 22,1918.

1 345,0 1 6 Patented June 29, 1920.

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. trolling system in whicha plurality. of sendl h sett ngpf selec ively UNITED STATES PATENT OFFICE.

ALBEN E. LUNDELL, 0! NEW YORK, N. Y., AND FRANKLIN A. STEAR'N, OF PATEBSON, NEW JERSEY, ASSIGHORS T0 WESTERN ELECTRIC COMPANY, INCORPORATED, 0! NEW YORK, N. Y., A OF NEW YORK.

TELEPHONE SYSTEM.

Specification of Letters Patent.

Patented June 29, 1920.

Application filed July 22, 1918. Serial N0. 246,234.

Be it known that we, ALBEN E. LUNDELL and FRANKLTN A. STEARN, citizens of the United States, residing at New York, in" the county of Bronx, State of New York,

and at Paterson,in-the county of Passiac and State of New Jersey, respectively, have invented certain new and useful ments in Telephone Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to electrical controlling systems and particularly to electrical controlling systems for automatic and semi-automatic telephone exchanges.

T: he object of the present invention is to reduce and simplify the impulse controlling units provided in automatic and semi-automatic telephone systems for the control of selector switches.

More particularly one of the objects of this invention is to provide improved and more efficient circuit arran ements to accomplish the features disc osed in a coendin application to A. E. Lundell, erial o. 139,511, filed December29, 1916. A portion ofthe present invention may be defined as .relating to anelectrical cons0 "'wh,"

. ds mr wltlolling" devices with" any one or the senders;

,A cor 'ngt djrie ret r ol th f 'niie tmh one Qi d plurality v 0f different automatic switches, Byzthis' arrangement. it possible to use,

of a link circuit;terminatesin'a for instance at a, semi-automatic operators position, cord finders ofsmall capacities,

which are usually of; simple construction, without increasing the number of sender selectors.

A further feature: invention contemplates the .useof acontrolling device at each of a plurality of operators positions, a plurality of sender's-common to the Improvec etm an he plurality of operators positions, and a plurahty of automatic switches -individual to each operators position for associating the controlling device thereat with an idle sender. I

According to another feature of the pres ent invention, a plurality of pairs of automatic switches are provided at each operators position to establish a connection between the cord circuits thereat and an idle sender, and means are provided individual to each pair of switches for connecting the controlling device at the operators position to the sender through only one of the switches of each pair.

Another feature of the invention is .the rovision of means whereby if either one o the switches of a pair of switches used in establishing a connection between the cord circuits and an idle sender fails to operate properly, both switches are released and another pair of switches are automatically started to establish the desired connection.

Another feature is the prowision of a line relay which is common to a plurality of switches. According to this feature the line relays which control the operation of the district selectors are. in the sender selector circuits which are common to a plurality of district selectors. v

i si disas s is which sava ed; mac- :91. difier t appara Ac ordiiisk o, t is fee.

A sen ,fi rther faaie riaesal iege t i g3 t i .ist ansmits;m P?! o one char ts 1--Whi9h ere ntroljonekindr apparatus such as: automatic switches, and impulses of. a different character which are; used to controll another kind of apparatus, such as a number indicating device.

Another feature relates to a new ing relay arrangement. I v Ajstill further feature relates to: a relay whichis arranged to, perform the functions of a line relay, a test relay and a release recount- Other features which relate to the present invention will appear in the followingvdescri tion and claims. However, it will be obvious to those skilled in the art that the Withthe exception ofthe sender selector all Figures 1 to 16 of the drawings taken together show diagrammatically a telephone exchange system comprising the various features of the present invention. The order in which the drawings should be considered is indicated in Fig. 17. As nearly as possible reference characters are used in the following manner: 1 to 99 in Fig. 1, 100 to 149 in Fig. 2, 150 to 199 in Fig. 3, 200 to 239 in Fig. 4, 240 to 299 in Fig. 5, 300 to 399 in Figs. 6 and 7, 400 to 499 in Fig. 8, 500 to 599 in Figs. 12, 15 and 16, 600 to 699 in Figs. 10 and 11, 700 to 799 in Fig. 13, 800 to 899 in Fig. 14, 900 to 999 in Fig. 9.

For the sake of convenience, the names used in the description for designating certain switching devices are displayed in the drawings adjacent to the showing of such devices. S and M designate sensitive and marginal relays and H and L high and low resistances respectively.

Selector switches.

The selector switches used in this system are of the so-called power driven type, described. in Patent No. 1,123,696 to E. B. Craftv and J. N. Reynolds issued Jan. 5, 1915. For the purpose of distinguishing the various selector switches from each other, they will be hereinafter referred to in the following manner: District selector (Fig. 1); ofiice selector 2); local incoming selector (Fig. 3); final selector (Fig. 4); and sender selector (Fig. 9).

Each of the selector switches has a vertically movable brush rod carrying brushes arranged to wipe over a commutator plate and thus control the operation of the respective selector switch. Each rod also carries brushes which are arranged to engage contacts of aterminal bank, by means 0 which connections to lines leading to switches or to I subscribers stations. may be established.

the selectors referred .to carr five sets of brushes, only one set ,of brus es' however, being shown in the'drawings. The terminal bank of the district, oflice, local incoming, and final selectors comprise 500 rows of terminals divided into five sections of one hundred rows of terminals each. Each set of brushes is arranged to engage any row of terminals ina certain section, and normally w rests below the first row of the terminals of each respective section. The brushes of a set are normally held apart by means'of a cam whereby they are out of the path of the terminals. By means of a tripping device associated with each of the selectors, any one of the brushes may be tripped to move its brushes into the path of the terminals of a John N.

Sequence switches.

-The sequence switches with the exception of sequence switch 300 shown in the present disclosure are of the type described in Patent No. 1127,808, issued Feb. 9, 1915, to fteynolds and Chas. "F. Baldwin. Sequence switches 10, 100, 150 and 200 control by means of their contacts, the circuits of the district, ofiice, local incoming and final selectors respectively. The sequence switch 900 controls the circuits of an operators keyboard; sequence switch 500 controls the circuits of a plurality of registers, sequence switch 700- controls the circuits of a sender, and sequence switch 800 also controls the operation of the sender and will be referred to as a class register.

The sequence switch 300 is of substantially the same construction as that' dis closed in the above mentioned Patent 1,127 808 except that instead of being driven by a constantl rotating drum it is moved step by step y v an operating magnet and any well knowng-ratchet and pawl arrangement.

The construction of each of the cord finders A and B and the allotter 400 is substantially the same as that disclosed in the above mentioned Patent 1,127,808.

All the sequence switch contacts shown in Figs. 1, 2, 3, 4, 6, 9, 11, 12, 13 and Mare controlled by the sequence switch shown in the respective figures. The contacts of cord finders A and B are shown to the left and right respectively of the vertical dotted line of Fig. 8. The contacts controlledbythe i llotter 400 are within the dotted square in Keyb card.

. to the depression of another key in the same row, or by the energization of a magnet 601, one being provided for each" row of keys. There are nine rows of keys, re-ferred to as the oflice, tandem hundreds, 'tandenf tens,

,tandem units, thousands, hundreds, tens,

units and stations rowsofke s. 'Each'row, with the exception of the 0, co and station keys, comprises keys numbered from zero to nine, each key controlling as many contacts as is necessary for'controllin the selectors and registers. The number 0 ofiice keys depends upon the traflic requirements. The

53.,saaoae oih ce keys are the equivalent of the tandem hundreds, tens and units of the keys; that is, the depression of one ofiice key is the equivalent of the depression of a combination of tandem hundreds, tandem tens and tandem units keys. The ofiice keys are provided for controlling theseizure of trunks leading to important offices, whereas other ofiices may be reached by depressing a desired combination of tandem keys.

Registers.

Figs. 12, 15 and 16 represent ten registers. These registerswi-ll be referred to as district brush, district group, ofiice brush, oflice- General arrangement of the impulse controlling apparatus.

The present invention is designed to be used in a telephone exchange system employing a plurality of operators positions. Associated with each operators position there are a plurality of cord circuits, one end of each cord circuit terminating in an answering plug and the other end in a district selector. A single keyboard is also provided at each operatorsposition. Common to all the operators positions there are a plurality of senders and associated with each sender is a set of registers.

A group of link circuits is provided at each operators position. One end of each of these link circuits terminates in a'sen'der selector which is arranged to select an idle sender whenever the link circuit associated therewith is taken for use. The otherfend of each link circuit terminates in a plurality of different cord finders, each of which has access to different cord circuits. For example, the link circuit shown in Figs. 8 and 9 terminates in cord finder A which is one of a plurality of cord finders having access to twelve cordsof a total of twentyfour cords; and it also terminates in cord finder B which is one of a plurality of cord finders having access to the other twelve cords of an operators position. A relay is associated with each link circuit whereby the operators keyboard, which is common to a particular group of link circuits, can be connected to the link circuit when it is taken for use. An allotter is associated with each grolp of link circuits so as to always have an i e circuit preselected.

. in order to simplify the disclosure only the apparatus and circuits of one operators pos1tion have been shown.

Translation.

The arrangement of the trunk terminals of the various sections of the terminal banks of the district and olfice selectors depends upon the trafiic requirements, and in the present case, it will be assumed that the in coming selector shownin Fig. 3 is accessible in response to the-depression of the A office key which controls the tripping of the third set of brushes of'the district selector, the stepping of these brushes on to the ninth group of terminals in the third sectionof the terminal bank, and then the tripping of the second set ofbrushes in the office selector and the setting of these brushes on, to the first group ofvterminals in the second section of the terminal bank of the office selector.

In the system disclosed, by means of the district and oflice selectors a ten thousand line exchange may be selected. If the called line terminates in an automatic exchange it is reached by the local incomin and final selector switches, each-of whic has 500 lines terminating therein- In the present case, it will be assumed that the number of the desired line is 3456. Then with switches of the above mentioned type it is necessary to trip the second set of brushes of the local incoming selector which will have access to trunks leading to a group of final selectors in which lines numbered 20003999 terminate. The second set of brushes will then be moved into operative relation with the third group of terminals served by this set of brushes. The trunks which terminate in this group lead to final selectors which'have access to lines numbered 3000 to 3499. The local incoming selector is then operated to select an idle trunk in this group. In the final selector associated with the selected idle trunk it will be necessary to trip the fifth set of brushes which will have access to lines numbered 3400-3499. The fifthset of brushes of the final selector will then be positioned below the sixth group of terminals in which terminate lines numbered 3450--3460. The brushes of the final selector will finally be moved into engagement with the seventh set of terminals of the sixth group, thereb completing the connection to the desired ine.

If, however, the called line terminates in a manual exchange, the manual exchange is reached by means of the district and office selectors or by trunks leading directl from the district selector to the manual 0 ce. Then a call indicator at said manual exchange will be operated in a well known manner to inform the operator thereatgofi, 380

the number of the called line. The impulses sent to this indicator will be of a different character from those which controlled the operation of the local incoming and final selector. This will be more fully described hereinafter in the specification.

General outline ofthe description.

idle sender to be connected to her key-' board. Both the keyboard and the sender are now connected. to the cord circuit assigned to be usedin extending the calling line. The operator then sets up the number of the'called line upon her keyboard, whereupon the registers, associated with the sender, are set. Then, depending uponthe setting of the registers, the operation of the district, ofiice, incoming and final selectors is controlled so as to complete the connection to the called line.

Second: A call from a subscriber at a semi-automatic exchange to subscriber at a manual exchange Wlll be escribed. In tracing this call it will be assumed that the manual exchange is reached by trunks leading directly from the district selector instead of from the. office selector. It will also be assumed that the same subscribers number is wanted at the manual exchange as was wanted in the first description. Therefore, the operator at the calling exchange will set u the same number on her keyboard as in tlie first case, withthe exgption that she will depress a different 0 cc key. The district selector is then con- .trolled by the sender so as to select an idle trunk leading to the desired manual exchange. When the operator at the manual exchange responds by depressing an assignment key, impulses are sent in accordance with the setting of the registers to operate a call indicator at the called exchange so that the number of the ca1led=line will be visually indicated at the manual operators position. She then com letes the connection to the called line by inserting a callin plug into the multiple jack of the calle Damptwn f the p n l a can to closed unless both cord finders associated semi-automatic exchange.

substation 201, Fig. 4, removes his receiver from the switchhook, whereupon the line relay 2 becomes energized and causes the lighting of the calling lamp 3. The operator inserts the plug 4 into the jack 5 associated with the calling line and a circuit is closed from grounded battery, winding of cut-oil relay 6, sleeve of 'ack 5, sleeve of plu 4 and the winding 0% rela 7 to ground. lelay 6 becomes energize opens the circuit of relay 2, whereupon lamp 3 isextinguished. Relay 7 becomes energized and closes a circuit from grounded battery,

armature and back contact of relay 8, re-

sistance 9, winding of relay 11, lower contact of sequence switch spring 12, righthand armature and contact of relay 7, condllttOIS 27 and 13, lower left-hand contact of sequence switch spring 14 to ground.

moving the sequence switch 10 out of position 1 and into position 2. As soon as sequence switch '10 leaves position 1 a lock mg circuit for relay 11 is closed from groiuided battery, armature and back conta; t of relay 8, resistance 9, winding of relay 11, inner left-hand armature and front contact of relay 11, winding of relay 14 to ground. Relay 14 energizes and connects vthe operators telephone set (not shown) to "the calling lines.

In position 2 of the sequence switch 10, a circuit is completed from grounded -batter ,power magnet of se uence switch 425 (o cord finder A WlllCl has access to a group of cord circuits comprising the particular cord circuit shown), lower contact of sequence switch spring 426, sequence switch spring 901, conductor 902, contact of spring 451 controlled by sequence switch 450 of cord finder B, conductor 401, lower left-hand contact of spring 402 of allotter 400, conductor 403, right-hand contact of sequence switch spring 16, outer right-hand armature and front contact of relay 15, conductor 17, lower left-hand contact of sequence switch spring 18 to ground. Sequence switch 425 thereupon moves out of position 17 and into position 18.

Itwill be observed at this point that the circuit for sequence switch 425 will not be with the preselected idle link circuit are in should also be observed that no other cord 

